Digital receiver of multifrequency signals with frequency recogn

Details Digital receiver of multifrequency signals with frequency recogn Digital receiver of multifrequency signals with frequency recogn

1982-08-20

1986-02-11

Malzahn, David H.

Boots, shoes, and leggings

179 84VF, G06F 1531, H04M 150

Patent

active

045702357

ABSTRACT:
The present invention relates to a digital frequency recognition device for a receiver of multifrequency PCM signals, and consists essentially in forming characteristic values V(f.sub.i) for each frequency f.sub.i, in forming characteristic values V(f.sub.i.+-.l) for adjacent frequencies of the code in question, in comparing the value V(f.sub.i) with the values V(f.sub.i.+-.l), the result of said comparison making it possible to deduce whether said frequency f.sub.i is effectively recognized. The invention is applicable to the signalling between automatic telephone exchanges or between subscribers and telephone exchanges.

REFERENCES:
patent: 3683162 (1972-08-01), Jacob et al.
patent: 4109109 (1978-08-01), Molleron
patent: 4302817 (1981-11-01), Labedz
patent: 4328398 (1982-05-01), Kawaguchi et al.
patent: 4354248 (1982-10-01), Conger et al.
patent: 4363100 (1982-12-01), Agnew et al.
patent: 4399536 (1983-08-01), Metz

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